Description
Philly Cheesesteak Casserole takes the bold flavors of the classic sandwich—tender roast beef, sautéed peppers, onions, mushrooms, and gooey provolone—then transforms them into a cheesy, bread-free casserole. Low-carb, keto-friendly, and packed with protein, this one-pan comfort dish is as satisfying as it is easy.
Ingredients
1 large (150 g) green bell pepper
1 large (150 g) yellow bell pepper
1 large (150 g) red bell pepper
2 tbsp (28 g) salted butter
1 small onion, thinly sliced (about ½ cup / 75 g)
3 cloves garlic, minced
8 oz (225 g) cremini mushrooms, thinly sliced
1½ lb (680 g) deli-style roast beef, thinly sliced
6 slices provolone cheese (about 6 oz / 170 g)
1 cup (100 g) shredded mozzarella cheese
Salt and pepper, to taste
Instructions
Preheat oven to 350°F (175°C). Slice bell peppers into thin strips.
In a large oven-safe skillet, melt butter over medium-low heat. Add onion and garlic, sauté for about 7 minutes until softened.
Stir in mushrooms and bell peppers, cook for 10 minutes until softened.
Add roast beef, tossing to combine. Season with salt and pepper.
Layer provolone slices on top, then sprinkle mozzarella.
Bake for 15 minutes, then broil for 2–3 minutes until cheese is bubbly and golden.
Let rest slightly before serving.
Notes
Add crushed red pepper flakes or jalapeños for spice.
Swap roast beef with ground beef, steak, or shredded chicken.
No oven-safe skillet? Transfer to a casserole dish before baking.
Mix in cheddar or Monterey Jack for flavor variety.
Great for meal prep—reheats beautifully.
- Prep Time: 15 minutes
- Cook Time: 25 minutes
- Category: Dinner
- Method: One-pan / Bake
- Cuisine: American